This is an extensive set of 14 lava tiles at 2x2 inches. Two tiles are only volcanic rocks. The remaining 12 are various designs with lava flowing about volcanic rock. You can create a pond or flowing rivers or just a volcanic rock environment. But wait there is more, as the commercial goes. Not only are there 14 designs with openlock connections, all 14 designs have an option of a flat base that I call a top cap. This means you can place the 14 designs on top of your own bases. The top caps can be increased in size by 125% and then be used on true tiles "Wyloch" bases as well. None of the 14 are mirrored so this would give you an additional 14 designs that are somewhat different.
The skull portal is not included in the set, but can be found here for free.
The magma pool is also not included, but can be found here.